1. College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
2. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academic of Sciences, Nanjing 210008, China
3. Bio-Chemical Analysis Team, Korea Basic Science Institute, Cheongju 28119, South Korea
4. University of Chinese Academy of Sciences, Beijing 100049, China
5. Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, Richland, Washington 99352, United States
6. Ecosystems and Global Change Group, Department of Plant Sciences, University of Cambridge, Cambridge CB2 3EA, U.K.
7. Department of Biology, Indiana University, Bloomington, Indiana 47405, United States
8. Department of Geosciences and Geography, University of Helsinki, Helsinki, FIN 00014, Finland